CN114337917B - Data transmission method based on forward error correction and short message sending method - Google Patents
Data transmission method based on forward error correction and short message sending method Download PDFInfo
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Abstract
The invention provides a data transmission method based on forward error correction and a short message sending method, which comprises the following steps: acquiring short message data to be sent; generating forward error correction parameters according to the short message data; dividing short message data according to forward error correction parameters to obtain at least one new data; performing forward error correction encoding operation on the new data to generate at least one redundant data; attaching the forward error correction parameter to the header of the new data and at least one redundancy data for multiple redundancy; and sending the short message data after forward error correction coding. The invention can ensure that any packet loss which does not exceed the redundancy rate in a group of data packets and redundant packets can still restore the message without adopting an ARQ retransmission method, thereby solving the problem of data loss in the one-way communication of the satellite Internet of things.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a forward error correction data transmission method and a short message sending method.
Background
Short message is one of the mainstream internet of things communication technologies in satellite communication systems, and currently, mainstream satellite communication systems such as Beidou system and iridium system in the market all provide short message communication technologies for internet of things, wherein the short message communication of the Beidou system can provide a success rate of more than 95%, and the sending frequency is generally 1 time every 30 seconds, and can reach 1 time every second at most. The regional communication capability may be up to 1750 bytes each time and the global communication capability may be up to 70 bytes each time. The global mobile transmission capacity of the short message of the iridium system can reach 340 bytes each time, and the transmission delay is less than 1 second on average. Global receiving capacity can reach 270 bytes each time, and transmission delay is less than 1 minute on average; the TCP/IP transport protocol, the Transmission control/network protocol, is also known as the network communication protocol. It is the most basic communication protocol in use of the network. The TCP/IP transport protocol specifies the standards and methods for communicating portions of the internet. And, TCP/IP transmission protocol is two important protocols that guarantee the timely, complete transmission of network data information.
According to the above analysis, the problems of the current satellite short message communication technology are as follows:
data is easily lost by using a direct transmission mechanism; the use of a message confirmation mechanism reduces transmission efficiency, and the confirmation information needs to be waited for after each short message is sent. In a satellite communication scene, the downlink bandwidth is generally much lower than the uplink bandwidth, and the confirmation information occupies too much downlink bandwidth to influence normal service; some satellite communication terminals are conditioned, may not provide a downlink function, and cannot realize a message confirmation mechanism, or adopt a half duplex mode, so that the terminals cannot transmit and receive data at the same time, the received data needs to be switched from a transmission mode to a reception mode, and when the received data is transmitted, the received data needs to be switched from the reception mode back to the transmission mode, and the transmission efficiency is seriously affected by frequent switching of the received confirmation information.
Further, since the RS code is a fixed-length operation, the generation operation of the redundancy protection data can be performed only when each data block participating in the operation reaches a predetermined same length. However, in network transmission, the message length may vary from application to application. Applications that interact frequently produce a large number of messages that vary randomly (e.g., instant messaging systems), which are not suitable for the fixed length nature of RS encoding. If the message is uniformly grouped into fixed length packets, the message must be filled with a filler (pad) to a specified length and then RS-encoded, but the bandwidth is very easy to waste in the process of message transmission because the message is filled with a large amount of filler.
Disclosure of Invention
The technical problem solved by the invention is that the forward error correction data transmission method and the short message sending method are provided, so that the packet can still be restored after any packet loss which does not exceed the redundancy rate in a group of data packets and redundancy packets is ensured, an ARQ retransmission means is not needed, and the problem of data loss in one-way communication of the satellite Internet of things is solved.
The invention solves the technical problems by adopting the following technical scheme:
a forward error correction based data transmission method, comprising: acquiring short message data to be sent, and caching the short message data to be sent; detecting whether the length of the cached data exceeds a preset length; if yes, merging the short message data to be sent in the cache; if not, detecting whether the caching duration of the cached data exceeds a preset duration; if yes, merging the short message data to be sent in the cache; if not, continuing to acquire the short message data; generating a forward error correction parameter according to the data length of the combined short message data, the maximum short message length and the delay of the current buffer memory message; dividing and recombining the combined short message data according to the packet length and the total number of the packets generated in the forward error correction parameters to generate at least one new data; inserting a frame head and a frame tail into the new data and performing forward error correction coding operation to generate at least one redundant data; attaching the forward error correction parameter to the header of the new data and the at least one redundancy data for multiple redundancy; and sending the short message data after forward error correction coding.
In a preferred embodiment of the present invention, the step of generating the forward error correction parameter according to the short message data includes: the message length of the short message data is a multiple of the forward error correction parameter.
In a preferred embodiment of the present invention, the step of generating the forward error correction parameter according to the short message data further includes: and generating a forward error correction parameter according to the combined data length and the maximum short message length.
In a preferred embodiment of the present invention, the step of dividing the short message data to obtain at least one new data further includes: when the number of the short message data exceeds one, merging all the short message data to be sent; and dividing and recombining the combined data according to the packet length and the total number of the packets generated in the forward error correction parameters to generate at least one new data.
In a preferred embodiment of the present invention, the step of performing the forward error correction encoding operation on the new data to generate at least one redundant data further includes: and inserting a frame head and a frame tail into each new data, and performing forward error correction coding operation to generate at least one piece of redundant data.
A short message sending method comprises the following steps: acquiring short message data to be sent through a short message reading unit; caching the short message data to be sent through a short message caching unit; detecting whether the length of the cached data exceeds a preset length; if yes, merging the short message data to be sent in the cache; if not, detecting whether the caching duration of the cached data exceeds a preset duration; if yes, merging the short message data to be sent in the cache; if not, continuing to acquire the short message data; generating forward error correction parameters according to the data length of the combined short message data, the maximum short message length and the delay of the current buffer message by a short message recombination unit, dividing and recombining the combined short message data according to the packet length and the total number of packets generated in the forward error correction parameters to generate at least one new data, inserting frame heads and frame tails into the new data and performing forward error correction coding operation to generate at least one redundancy data, and attaching the forward error correction parameters to the new data and the heads of the at least one redundancy data to perform multiple redundancy; and transmitting the short message data subjected to forward error correction coding by using a short message transmitting unit.
The technical effects achieved by adopting the technical scheme are as follows: the method comprises the steps of temporarily storing a message to be sent through a buffer unit, enabling the message to be sent to meet multiple RS coding parameters after segmentation, such as RS (255, 223), RS (544, 514) and the like, dynamically generating the RS coding parameters by a reorganizing unit according to the time delay of the current buffer message and the length of the message, enabling the length of the message to be segmented to be multiple of the RS coding parameters, segmenting the message, inserting frame heads and frame tails into each segment, performing RS coding operation on the segmented message, enabling the segmented message to generate multiple redundancy packets, and attaching relevant parameters of RS coding to the data packets and the redundancy packet heads to perform multiple redundancy. The invention can ensure that the packet loss of any packet which does not exceed the redundancy rate in a group of data packets and redundant packets can still restore the packet, and solves the problem of data loss in the one-way communication of the satellite Internet of things without an ARQ retransmission method, can improve the reliability of data transmission, can allow a plurality of short messages to be transmitted to lose one or more packets at will, does not influence the integrity of transmitted data, and also improves the efficiency of data transmission on the basis of improving the reliability of data transmission, thereby avoiding the problem of waiting for acknowledgement information (ACK) after transmission.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
Fig. 1 is a flow chart of a forward error correction based data transmission method according to an embodiment of the present invention;
FIG. 2 is a forward error correction schematic diagram illustrating an embodiment of the present invention;
FIG. 3 is a specific flow chart of a forward error correction based data transmission method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a short message sending device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a short message transmission system according to an embodiment of the present invention.
Detailed Description
In order to further illustrate the technical means and efficacy of the present invention as utilized to achieve the intended purpose, embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are only some, but not all, embodiments of the invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on the embodiments of the present invention, are within the scope of the embodiments of the present invention. While the invention may be susceptible to further details of embodiment and specific details of construction and operation for achieving the desired purpose, there is shown in the drawings a form a further embodiment which may be used herein before to provide a further understanding of the invention.
The present disclosure mainly proposes a solution to the problem that Reed-Solomon coding used in modern Forward Error Correction (FEC) is a fixed-length code, which means that a fixed-length input will be processed as a fixed-length output, and 223 input symbols in a common RS (255, 223) will be encoded as 255 output symbols. The length of each message sent by the terminal in the actual service is not fixed, and the problem that the length of the message is far smaller or far larger than the RS coding parameter exists, so that the RS coding is not applicable.
The invention overcomes the defects of repackaging data to be sent, forward error correction coding and decoding and the like by improving the transmission mechanism of the short message.
Referring to fig. 1 and 3, fig. 1 is a flowchart illustrating a method for transmitting data based on forward error correction according to an embodiment of the present invention; fig. 3 is a specific flowchart of a forward error correction based data transmission method according to an embodiment of the present invention.
As shown in fig. 1 and 3, the forward error correction based data transmission method of the present invention comprises the steps of:
step S1: and acquiring short message data to be sent.
The short message is one of the mainstream internet of things communication technologies in the satellite communication system, and currently, the mainstream satellite communication systems such as the Beidou system and the iridium system in the market all provide the short message communication technology for the internet of things direction. The TCP/IP transport protocol, the Transmission control/network protocol, is also known as the network communication protocol. It is the most basic communication protocol in use of the network. The TCP/IP transport protocol specifies the standards and methods for communicating portions of the internet. And, TCP/IP transmission protocol is two important protocols that guarantee the timely, complete transmission of network data information.
The satellite short message is used as a communication mode with lower transmission rate and smaller transmission data quantity, and a message confirmation mechanism is generally not used, but a direct transmission mechanism is adopted. The direct transmission mechanism does not perform any reliability design on short message transmission and reception, nor does it perform any recoverable design. In the process of transmitting the short message through the satellite network, the problems of satellite coverage area switching, ionization electromagnetic interference and the like may be encountered, so that the receiving end cannot receive the correct short message, even cannot receive the short message, and the problems of data loss and even unaware of the receiving end are caused.
Optionally, the step of acquiring the short message data to be sent further includes: caching the short message data to be sent; detecting whether the length of the cached data exceeds a preset length; if yes, merging the short message data to be sent in the cache; if not, detecting whether the caching duration of the cached data exceeds a preset duration; if yes, merging the short message data to be sent in the cache; if not, continuing to acquire the short message data.
Step S2: generating forward error correction parameters according to the short message data.
Forward error correction: also called forward error correction code (Forward Error Correction, abbreviated as FEC), is a method for increasing the reliability of data communication. In a unidirectional communication channel, once an error is found, its receiver will not have the right to request a transmission. FEC is a method of transmitting redundant information using data, and when an error occurs in transmission, a receiver is allowed to reconstruct the data. Forward error correction is commonly used in video and audio data transmission.
Optionally, the step of generating the forward error correction parameter according to the short message data includes: the message length of the short message data is a multiple of the forward error correction parameter.
Optionally, the step of generating the forward error correction parameter according to the short message data further includes: and generating a forward error correction parameter according to the combined data length and the maximum short message length.
Step S3: and dividing the short message data according to the forward error correction parameters to obtain at least one new data.
Optionally, the step of dividing the short message data to obtain at least one new data further includes: when the number of the short message data exceeds one, merging all the short message data to be sent; and dividing and recombining the combined data according to the packet length and the total number of the packets generated in the forward error correction parameters to generate at least one new data.
Step S4: the new data is subjected to a forward error correction encoding operation to generate at least one redundant data.
Optionally, the step of performing a forward error correction encoding operation on the new data to generate at least one redundant data further comprises: and inserting a frame head and a frame tail into each new data, and performing forward error correction coding operation to generate at least one piece of redundant data.
Step S5: and adding the forward error correction parameter to the new data and the header of the at least one redundancy data for multiple redundancy.
Step S6: and sending the short message data after forward error correction coding.
Referring to fig. 2, as shown in fig. 2, the data blocks D1, D2, D3, D4 are subjected to forward error correction encoding to form D1, D2, D3, D4, C1, C2, wherein C1, C2 are redundant data, P is a forward error correction parameter, the data blocks may lose D3, C1 through short message transmission, but the original data of D1, D2, D3, D4 may still be recovered through forward error correction decoding, so as to ensure that the data is not lost.
The embodiment of the invention provides a method for dynamically configuring RS coding parameters and separating redundant packets from data packets based on a forward error correction data transmission method, which solves the problem that only one-way communication can be used in the Internet of things of a satellite, ensures certain data reliability and optimizes bandwidth consumption. In this embodiment, the buffer unit temporarily stores the message to be sent, so that the message to be sent after being segmented satisfies multiple RS coding parameters, such as RS (255, 223), RS (544, 514), and the like, and the reorganizing unit dynamically generates the RS coding parameters according to the delay of the current buffer message and the length of the message, so that the length of the message to be segmented is a multiple of the RS coding parameters, then segments the message, each segment is inserted into a frame header and a frame tail, performs RS coding operation on the segmented message, so that the segmented message generates multiple redundancy packets, and then attaches relevant RS coding parameters to the data packets and the redundancy packet header for multiple redundancy. The method of the invention ensures that the packet loss of any packet which does not exceed the redundancy rate in a group of data packets and redundant packets can still restore the packet without ARQ retransmission means, thereby solving the problem of data loss in the one-way communication of the satellite Internet of things.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a short message sending device according to an embodiment of the present invention.
The invention also provides a short message sending method applied to the short message sending device.
As shown in fig. 4, the short message transmitting apparatus includes: short message reading unit, short message reorganizing unit and short message transmitting unit. According to the short message sending method, short message data to be sent are obtained through a short message reading unit; generating a forward error correction parameter according to the short message data by the short message reorganization unit, dividing the short message data according to the forward error correction parameter to obtain at least one new data, performing forward error correction coding operation on the new data to generate at least one redundancy data, and attaching the forward error correction parameter to the new data and the head of the at least one redundancy data to perform multiple redundancy; and sending the short message data subjected to forward error correction coding through the short message sending unit.
Optionally, the short message sending device further includes: a short message buffer unit; the short message buffer unit is used for buffering the data read by the short message reading unit.
Illustratively, the short message reading unit: for reading the data to be sent by the upper layer application upper computer. Short message buffer unit: the buffer memory is used for buffering the data read by the short message reading unit. Short message reorganizing unit: the unit firstly merges the data in the buffer memory, then segments and reorganizes the merged data according to the packet length and the total number generated in the forward error correction parameters to form a new data packet group, and then uses the forward error correction coding unit to perform forward error correction coding on the new data packet group. Short message sending unit: for transmitting the forward error correction coded data packets.
Alternatively, the short message sending device of the present embodiment may execute the forward error correction data transmission method in the foregoing embodiment.
Referring to fig. 5 in conjunction with fig. 4, fig. 5 is a system block diagram of an embodiment of a short message transmission system according to the present invention.
The short message transmission system of this embodiment includes: the short message sending device and the short message receiving device described in the above embodiments.
Optionally, the short message receiving device includes: short message receiving unit: the short message receiving module is used for receiving the short message transmitted by the satellite network; short message buffer unit: the method is used for caching the received short message; short message recovery unit: the data processing unit is used for recovering the data of the same data packet group, judging whether the data of the data packet group can be subjected to forward error correction decoding according to the forward error correction parameters, and decoding by using a forward error correction decoding unit; short message use unit: and the method is used for sending the decoded data packet to an upper computer or an upper application for use.
It should be understood that, although the steps in the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, or the order of their execution may not necessarily be sequential, but may be performed in rotation or alternating with at least some of the other steps or sub-steps of other steps.
From the foregoing description of the embodiments, those skilled in the art will readily appreciate that embodiments of the present invention may be implemented in hardware, or by means of software plus a necessary general purpose hardware platform. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product, where the software product may be stored in a non-volatile storage medium (may be a CD-ROM, a U-disk, a mobile hard disk, etc.), and includes several instructions for causing a computer device (may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective implementation scenario of the embodiments of the present invention.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the embodiments, the above examples and the accompanying drawings are exemplary, and the modules or processes in the drawings are not necessarily required to implement the embodiments of the present invention, and should not be construed as limiting the present invention, and various simple modifications and combinations of the technical solutions of the present invention may be made within the scope of the technical concept of the present invention, and all of the simple modifications and combinations are within the scope of the protection of the present invention.
Claims (3)
1. A forward error correction based data transmission method, the method comprising:
acquiring short message data to be sent, and caching the short message data to be sent;
detecting whether the length of the cached data exceeds a preset length;
if yes, merging the short message data to be sent in the cache;
if not, detecting whether the caching duration of the cached data exceeds a preset duration;
if yes, merging the short message data to be sent in the cache;
if not, continuing to acquire the short message data;
generating a forward error correction parameter according to the data length of the combined short message data, the maximum short message length and the delay of the current buffer memory message;
dividing and recombining the combined short message data according to the packet length and the total number of the packets generated in the forward error correction parameters to generate at least one new data;
inserting a frame head and a frame tail into the new data and performing forward error correction coding operation to generate at least one redundant data;
attaching the forward error correction parameter to the header of the new data and the at least one redundancy data for multiple redundancy;
and sending the short message data after forward error correction coding.
2. The method of claim 1, wherein the step of generating forward error correction parameters from the short message data comprises:
the message length of the short message data is a multiple of the forward error correction parameter.
3. The short message sending method is characterized by comprising the following steps:
acquiring short message data to be sent through a short message reading unit;
caching the short message data to be sent through a short message caching unit;
detecting whether the length of the cached data exceeds a preset length;
if yes, merging the short message data to be sent in the cache;
if not, detecting whether the caching duration of the cached data exceeds a preset duration;
if yes, merging the short message data to be sent in the cache;
if not, continuing to acquire the short message data;
generating forward error correction parameters according to the data length of the combined short message data, the maximum short message length and the delay of the current buffer message by a short message recombination unit, dividing and recombining the combined short message data according to the packet length and the total number of packets generated in the forward error correction parameters to generate at least one new data, inserting frame heads and frame tails into the new data and performing forward error correction coding operation to generate at least one redundancy data, and attaching the forward error correction parameters to the new data and the heads of the at least one redundancy data to perform multiple redundancy;
and transmitting the short message data subjected to forward error correction coding by using a short message transmitting unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106559180A (en) * | 2016-12-08 | 2017-04-05 | 西安烽火电子科技有限责任公司 | ARQ short message communication means based on rate-compatible LDPC code |
| CN110430009A (en) * | 2019-06-29 | 2019-11-08 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Multi-user association code modulation system |
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| CN104333850B (en) * | 2014-09-25 | 2018-02-16 | 北京华力创通科技股份有限公司 | Short message read method based on Big Dipper communication |
| US9992126B1 (en) * | 2014-11-07 | 2018-06-05 | Speedy Packets, Inc. | Packet coding based network communication |
| CN109510659A (en) * | 2019-01-11 | 2019-03-22 | 北京华力创通科技股份有限公司 | Short message transmission method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106559180A (en) * | 2016-12-08 | 2017-04-05 | 西安烽火电子科技有限责任公司 | ARQ short message communication means based on rate-compatible LDPC code |
| CN110430009A (en) * | 2019-06-29 | 2019-11-08 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Multi-user association code modulation system |
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